Gas producer grate



Sept. 18, 1934. c w 1,974,374

GAS PRODUCER GRA TE Filed March 14, 1951 2 Sheets-Sheet 1 This inventionrelates kind in which the air for limited combustion of the fuel isadmitted to of theproducer grate i D: T S? PATENT easrrtonncsn GR TE j vCharles Whitfield; Acton, London, England I Application March .14; 1931,semi No. 522,743 In Great BritainjJanuaryZ'Y, 1931 5 Claims; ,(Cl.126-163) to gas producers of the small separate sections throughair-distribution chambers, having restricted air openings thereto asdescribed in my co-pending application for patent, No. 465,966.

The invention relates more particularly to large abovekind, to the grateof be supplied by one or more gas producers of the which the fuel mayhoppera or less constant In such a producergthere inequality in thedistribution ordepth of fuel on the grate,-the fuel being deeper will bea more immediately below the hopper mouth.

for such or like uneven f The object of the invention is to compensateuel distribution and the unequal resistance of the fuel bed forthe-several sections resulting therefrom.

According to the invention the gas producer is of the kind in which theair for limited combustion of the fuel is admitted to small separatesections of the producer grate through air distribution chambers havingrestricted air openings thereto, and is characterized in that therelative area of the said restricted openings, compared with that of thegrate sections which they supply, is graded over the area of the grate.

In the accompanying drawings:-

Fig. l is a plan of one example of gas producer qgrate made inaccordance with the invention.

Fig. 2 is a sectional elevation on'line 2-2 of Fig. 1.

Fig. 3 is an underneath Fig. 4 is a sectional elevation on line Fig. 3.

As illustrated, the grat plan of Fig. 1.

e comprises bars a havtending flanges.

bars are solid ribs at extending face and shown in section in Fig. 4.

the webs of adjacent to the grate sur- The air Between supply surface ofthe grate consists of transverse slits e in the overhanging portions ofthe grate surface and longitudinal slits 3 formed between ;the bars, thesolid portions d forming spacing members. per or open downwards therelease of ash, etc.

The air supply apertures e and f tain known manner for The ends of thebars and the side bars are formed with a flange g by which ,they aresupported in Between the webs a,

the frame h of the grate. which are formed with a small head at theirlower edge, are positioned slides i which are shown as close a fit as ispractic lower ends of the ribs 01.

with clearance but are ally possible against the The slides a fitagainst each chamber, the holes being size.

and are supported upon a lowerset of laterally extending flanges formedby the bars a projecting beyond the webs b. In the slides are-holesforming therestricted air inlet passages to the chambers is formedbetween the webs and the ribs 'd. The. slides are shown with one hole afor graded insize so; that those for the inner chambers are larger thanthose forthe outer chambers; A plurality of smaller holesmay be used andtheir number varied so that their total areas are similarly graded.

The same effect of grading for the restricted inlets can be obtained by:varying the. size of the chambers and having the holes a, all the same;The disadvantage of such a form however would be obviously that each barwould have tobe different. The slides i are intended to heal: ways in,as shown, while the grateis working, but can be withdrawn to releaseash,;etc.,,f rom the chambers.

The arrangement shown is suitable for a grate having a single centralfeed hopper which would give a normal inequality of depth of fuel on thebed being thinner towards the outer sections. This arrangement providesfor a greater restriction of the air supply to the outer or sidesections of the grate where the fuel bed will be shallower than on thecentral sections immediately below the hopper, and this greaterrestriction will be proportioned so as to compensate for the differenceof resistance of the fuel bed to the passage of the air.

The natural fall of the fuel on to the grate will ensure a more or lessconstant inequality in the depth of the fuel and hence the resistance ofthe fuel bed and the required grading or difference of restriction ofthe air openings can be easily ascertained experimentally or otherwise.Obviously, where two or more hopper feeds are provided or where otherconditions make grading desirable, the areas of grading for therestricted air openings will be arranged accordingly.

What I claim is:--

1. A grate for a gas producer consisting of a plurality of adjacentgirder-like bars, upper and lower flanges extending laterally from thesides of said bars, apertures in and between upper flanges of adjacentbars for feeding air to fuel supported thereon, transverse websextending laterally from said bars at predetermined distancestherealong, the webs of adjacent bars forming end closures andpartitions, slidable plates resting bars and co-operating with said websto form chambers between adjacent bars, air inlet aper- "grate, the fueltures in said plates of graded size, the smaller apertures being forchambers in the outer portions of the grate and increasing in size forchambers located nearer the center portion of the grate, the inlet areaof any chamber being considerably less than the area of grate aperturesfor that chamber.

2. A grate for a gas producer provided by a grate assemblage constructedand arranged so as to have an upper fuel supporting surface withsubdivided air chamber sections below said fuel supporting surface, andso as to have lower apertured members for completing the floors of theair chamber sections, the fuel supporting surface having air outletapertures therethrough leading from the chamber sections, the aperturesin the lower members providing air inlet passageways or openings leadingto the air chamber sections, the total area of the air inlet passagewayfor each chamber section being considerably less than the total area ofthe air outlet apertures leading therefrom, the air inlet passagewaysbeing graded whereby the relatively larger air inlet passageways areprovided for the centrally located air chamber sections.

3. A grate for a gas producer having grate bars providing an upper fuelsupporting surface with subdivided air chamber sections below the fuelsupporting surface, said grate having lower apertured plates providingfloor members for the chamber sections, the fuel supporting gratesurface having air outlet apertures therethrough leading upwardly fromthe chamber sections, the

apertures of the lower plates providing air inlet 'openings leadingupwardly to the chamber sections, the total area of the air inletaperture for each chamber section being considerably less than the totalarea of the air outlet apertures ,for the corresponding chamber section,the air 'along, the webs of adjacent bars forming enclosures andpartitions, slidable plates fitted against the other set of flanges ofadjacent bars and cooperating with said webs to form chambers betweenadjacentbars, air inlet apertures in said plates of graded size, thesmaller apertures being for chambers in the outer portions of the grateand increasing in size for chambers located nearer the center portion ofthe grate, the inlet area of any chamber being considerably less thanthe area of grate apertures for that chamber. l

5. A grate for a gas producer comprising a fuel-supporting member formedinterio-rly with 00 a plurality of separate chambers, said member havingair outlet apertures in its upper face extending from each of saidchambers and having air inlet apertures in its lower face extending fromeach of said chambers, the total area of the said air inlet aperturesfor each chamber being not more than one-third of the total area of thesaid outlet apertures for the same chamher, and the ratio of area of theinlet apertures v relative to that of the outlet apertures for the outerchambers of the grate being smaller than such ratio for the centerchambers of the grate r CHARLES WHITFIELD.

